/* -*- coding: utf-8 -*-
 *
 * 3264.cc:  No.3264 蟯ｩ莠墓焚 - yukicoder
 */

#include<cstdio>
#include<algorithm>

using namespace std;

/* main */

int main() {
  int n;
  scanf("%d", &n);

  printf("%d%d\n", n, n);

  return 0;
}